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The hydrothermal synthesis and single crystal XRD characterization of a three-dimensional open-framework tin(II) phosphonopropionate oxalate, Sn4(O3PCH2CH2CO2) 2- (C2O4), is described; the structure contains two different bifunctional linkers as well as SnO3 and SnO4 polyhedra each with a stereochemically active lone pair of electrons, and exhibits several types of channels.
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Stock et al. (2000) studied this question.
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